Knowledge Bank

The Fourier transform absoption spectra of $NH3$ with a resolution of $0.005cm-1$ were recorded at Laboratoire D'Infrarouge of Universite de Paris-Sud. The assignment of the $\nu 1+\nu 2$ and $\nu 2+\nu 3$ bands of $NH3$ has been carried out for the J value as high as 13. The inversion-rotational energy levels of the ground states of $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}NH3$ has been calculated. These energy levels are compared with the best previous $work(1)$ which shows an agreement within $0.001cm-1$.